First off, the Avengers show is based on the Ultimate Marvel Universe timeline instead of the main Marvel Universe one. Whats the Ultimate line in the Comic Books? its a re-imagining of the characters and their origins. Basically, it has allowed new writers to retell characters with the ability to twist everything you have known about them with out actually touching each characters real history. An example, in the Ultimate universe Nick Fury is a dark skinned character while in the regular Universe he is light skinned to give you a better understanding.